Septic tank



Oct. 4 1927.

' 'H. A. LEDYARD ET AL SEPTIC TANK Filed Nov. 11, 1925 Patented Oct. 4, 192 7.

I name srarss mesa aries.

HARRY A. 'LEDYARD AND JAMES J. JELLEY, on 'AsnLAnn, OHIO; SAID JELLEY;

ASSIGNGR TO SAID LEDYARD. a r

snr rrc TANK.

Application filed November 11, 1925. 7 Serial l lo. 68,430.

This invention isdirected to a septic tank,

designed more particularly for household use, wherein the discharge of sewage thereto is not continuous. V

The invention has for its principal, object the combination with a septic tank of an automatic siphonic discharge, whereby under the accumulation of a predetermined amount of purified hquidin the tank, a dlscharge thereof will automatically take place, 7

in order that the tank may remain in continuous service without attention or clearing.

A further object of; the invention is the provision of a tank of this characterwherein thepurification of the sewage is through the activity of anaerobic bacteria, and in which activated sludge for meetingv the incoming sewage, a settling sect on receivlng the flowtank provision is made for maintaining an and permitting the necessary quiescence for the bacterial change of the sewage.

The

purified water is then permittedto flow .to a

' delivery chamber, in which it accumulates to I on the line 3-'3 of Figure 1.

a depth to induceautomaticoperation of the siphonic discharge.

The invention is illustrated in the accompanying draw1ng, 1 n wh1ch:

Figure 1 1s a View 1n long tudinalsection of the improved septic tank'and automatic dlscharge therefor. I Flgure 2 1s a plan of the same, pl I s .Figure 3 1s an enlarged transverse section -Figure 4 is an enlarged section on the line H of Fig, 1. v

The improved septic tank, in the form illustrated, .is preferably made of concrete,

of hollow construction, and inappropriate size. This tank 1 is designedto be buried in the. ground below the frostline, and sealed against the admission of air except as such may enter with the sewage. v The tank is divided by a vertical partition 2, extending the height'of the water level of the tank and arranged near the outlet end, into a delivery chamber 4, and a purifying chamber 5. The purifying cham-' ber is provided with partitions 6 and 7 ,de

pending from the top-thereof, and terminating above the mid-height of the tank.

' Partition 6, which arranged about-mid length of the purifying chamberdefines an initial treating or what might'be termed. an.

activated sludge tank 8, while partitionli,

which is arranged adjacent the partition 2,

defines withpartition 6 a final, treating tank, and with partition 2 a space 9 vfor maintainmg the water in more or less quiescent state prior to its passage into the delivery tank.

Partitions 6 and 7 also support the cover A.

The sewage is delivered to the initial, or

activated sludge tank 8, through an inletlO, I

pipe ll,opening below the level "or the fluid inthetank, the inlet opening upwardly, as at 12, to permit the .air'entering with the sewage, to accumulate above the fluid in the which. delivers the material through a downingsewagefand settles to'the'bottom of tank 8, and forms a scum for the propagation of thebacteria, while the heavier. materials settie and is attacked'by the bacteria. .Theac- I cumulation gradually"fiows .to the final treatingtank, rising gradually and quietly over an inclined partition 14, the lower end of which seats in a recess inthefioorofthe tank .8, and, from which this partition inclines upwardly, spaced froni'the lower end of partition, 6 and terminating 'inYthe iinal treating tank slightlyfbelowfthe' predetermined"height of fluid for the tank. 7 The 7 summary action of the bacteria in the initial V tank is continued 1n the fin al treating tank, 4

the.provision of the inclinedpartition per- .mitting the gradualflow or" the fluidjfrom one tank to the-other without agitation, and

permitting such bacterial action to'continue in the final treatin tankin that quiescent state best adapted or s'uch'action.

The automatic discharge is in the form of asiphon 15, with a short leg 16 arranged in the delivery tank and having an air-inlet above the lower open end 'anda long leg l8 arranged beyond the tank proper. The con nection 19 between the legs of the siphon-is substantially at the height: determined as the normal height of the fluid inthetank The long leg of the siphon discharges into anopen pm 20, having an upwardly-inclined V discharge lip or section 21, and pivotally 1' supported in a casing 22 made in two sec- .tions andremovably securedtogethenas at 23. The casing has an outlet section 24;

I whichmay be connected to any suitable form of. conveyor tocarry the fluid to a-pointof discharge, For. example, such conveyor "fma'y be' in the form of hollow tiles with V fs aced joints to permitlthe water to dis- 10 I thef'soil, thoughany'other discharge maybe provided; I a i 'flWhen thepurified waterin the finaltreating ank rises between, the J partition "7 and i i I 15, partition 2, and. reaches" the opening '25 in Z tank or chamber' Landfill-the short leg of the siphon. When'reaching'theappropriate V heightIthe-water will gradually flow throughchamber 4 until theheadjxof the waterin drawing theiair from thelongleg of he fsiph0n,fa d starting the siphonic action.

' accumulatingin the'delivery chamber above j'the; siphon during theinitia read of water contributes to the air dis- 'f thatfis in the; absence of water therein a in 9 19; horizontal position, against a stop 26, and under tilting is limited bya similar "stop-27. 7 siphoni'caction' continues until ai sufiis f theseat, when the dischargelwill then cease 1 until 7 a further accumulation of water in i, thefxidelive'ryLchamber. The; pliedetermined :heij ht of water in the: delivery tank ,at'which I; disc ar'ge commences ispreferably controlled a 1; bymoving the pan" fart her or nearer tothe ;."'end ;of the long leg of the siphomias obvi- "iously fif Monger period is required to seal "the o en :e d, of the long leg Orr-he si hon;

', the wa er wil rise higher in "the delivery tank V'beforerommencingw the discharge,"

5 This adjustment isgirovided for by support- 'i'ng"thef c sing 22 om the lon i'leg' ot the as d i e c arge at each 'jointfor the'enriohm'entot "the latterjit will accumulatein" the delivery T the connection;19, and'down the longrleg of v ,thesiphon into'thepan 20, sealing the lower [-0 Knead of the leg 18f andtrapping the air t- 'erein,;which' causes thewater to fill the is the same height in-inches orf th el fiklfii sibf course,understoo'dj that the owater is action, andthis' charge ffrom the long leg of thejjsiph'on' The an-V2.0 is so .hung asito be normally,

cientj f liantit I of the-WB fhasbeen drawn, "from t e ten to levelqof thefbottoms of the v l pipe; The hole or vent "1 7 in the short leg of the "isi'phon -permits air to enter breairingv siphon through the medium of screws 28,; fthus permitting the distance of the pan from- ,{the [open je'nd' 'ofithe siphon "leg to be regui'The 1 improved septic tank thus, permits thepropagation of the bacteria, and the sludge at the bottom of theinitial tank is- 7 always activated to meet the incoming sew- 9 age. -.The'activity of the bacteria is permitted to take place under that state of quiescence best adapted'for their operation;

andthepurified water is autom'aticallydis-Q I i charged under predetermined accumulation.

The tank is thus entirely automatic, and may be permitted to function for years with f out attention,

The

more particularlyin Fig. 2.

The scum; sludge or the like breeds more bacteria which destroy and decompose the.

pan 20 is mounted upon trunnions 29, which-a1e in turn journaled in bearings 30. The inclined'partition 14 is supported upon brackets31 molded in the" concrete septic tank on each side thereofas shown sop solid'material and this acti ontakes'pla'ce a continuously in the quiescent chambers which are spacedapart by baflie or partition boards.

The 'bafile or partition boards areadapted tokeep the scum or solid particles-from flowing freely.throughthe'tank; The liquid por- 'tions thereof percolate through the throat of the siphon'to the long legdisplacing the 7 air and til i g the pa I Attention isfcalled .to thetacttliatfthe flow of sewa'ge in the septic tank fiows' throughout the entire width therein without obstruction or interference in any way.

other words a part'iof the sewage doesnot flow through a; certain specific' openi'ng; but

ows evenly the 'full width oft 'thefseptic' tankJfl 7 Having thus described is claimed as new, is

1. Aseptic tank whereinmeans are'pr'of the invention, what I vided for the: bacterial treatment of the sewage whereby the flow of the sewage is free 'to flow quiescent throughout the 1111 width, bracketsimbedded inthe side walls of the tank, in'combination'with an'inclined;

partition for directing-theV-flowof sewage,-

which issupported by saidlbrackets, a delivery'chamber'in saidtank forthe accumu lation of purified water from the sewage, i"

partitions arranged in the tank to baffle the flow ofliquid to retard. its naturalflow and f a siphon opening into such chamber which is automatically started under a predetermined head of water insu'ch chamber and-stopped from flowing at I a predetermined time;

2 In a septic tank provided with a series of barriers spaced apart from-the top and bottom of the tank, in combination with an.

inclined partition which-"is spaced apart Y from the top of the tank-and" one of the depending barriers to retard.- and direct the flow ofthe sewage and keep same in 'a.

quiescent state to permit thebacterial treatment thereof, said flow being unobstructed and without interference so that the flow @37 v will be quiet throughout the full width area of the tank, brackets imbedded in the sides of the tank to support the inclined partition, a siphon, and means comprising a tiltable vessel whereby said fluid is automatically permitted to flow from the tank when the vessel is filled with a predetermined "amount of liquid and prevented from flowing therefrom until predetermined time, as v and for the purpose described p In testimony whereof we afii'x our signa- 

